Police say they found weapons and anti-Semitic information at Reardon's home. Reardon confirmed an MP-40 submachine gun and an assault rifle were his, according to the federal complaint against Reardon.

Reardon told an FBI agent he makes satirical videos with friends that often use "racial and violent depictions for humor," the complaint said.

A message seeking comment was left with Reardon's attorney.

An investigation continues, including of whether others were involved, U.S. Attorney Justin Herdman said Thursday.

The Constitution permits many types of speech, including unpopular comments, but not threats of violence, Herdman said.

This undated photo provided by the Mahoning County Sheriff's Office shows James Reardon Jr. Police say Reardon, accused of making what they believe was a threat to a Jewish center in Ohio on Instagram, was arrested Saturday, Aug. 17, 2019, on telecommunications harassment and aggravated menacing charges. (Mahoning County Sheriff's Office via AP)